How to get rid of old system tray icons
How can I remove obsolete items in the "Past Items" section of the "Start Menu->Properties->Task Bar->Customize" list.
I have lots of items from software that I've replaced - eg the Comodo Firewall.
I also have a number of items that have the wrong icon - eg the list has an Item for Windows Live Mail, but its icon is a red Windows Security Shield.

For XP, try this:
http://www.tweakxp.com/article37505.aspx
I haven't personally tested this.
Other methods can be found by Googling "Removing Past Items".
Worked for me, but after deleting the reg keys, I needed to restart rather than just close/open explorer.exe.
Thanks Peter for the great tip - and to Urbane.Tiger for the great question.
Mal (XP-SP3)
Maybe try the same query at Microsoft.com ...
I have the same problem. Any advice out there?
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